Method and multi-ejector type of system for purifying the polluted poisonous exhaust gas

ABSTRACT

A method and A multi-ejector type of system for efficiently purifying the polluted poisonous exhaust gas, which is inevitably generated from the progress of work of the manufactories of various kinds. This multi-ejector type of system comprises a pre-processing part and a post-processing part. The former part preliminarily removes dust from the exhaust gas and causes the temperature of the exhaust gas to be reduced to a predetermined degree, while the latter part neutralizes and washes the exhaust gas, which has been processed in the former part, so as to cause the pollutants to be completely removed from the exhaust gas. Here, the former part is connected to the latter part through a plurality of pipe lines. This multi-ejector type of system has a such simple construction that it is run on a small scale and is inexpensive and this makes the system be easily equipped without expensive burdensome. In addition, this system permits the pollutants to be completely removed from the polluted poisonous exhaust gas so as to improve the purification efficiency.

This is a division of application Ser. No. 08/031,418, filed Mar. 15,1993, pending.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates in general to purification of pollutedpoisonous exhaust gas, and more particularly to a method and amulti-ejector type of system for efficiently purifying such a pollutedpoisonous exhaust gas, which is inevitably generated from the progressof work of the manufactories of various kinds.

2. Description of the Prior Art

It is conventionally noted that progress of work of the manufactories ofvarious kinds, such as for manufacturing the leather goods, the iron andsteel goods, the food, the wall paper, the plastic goods and the like,inevitably causes a polluted poisonous exhaust gas containingpollutants, such as DOP (dioctyl phthalate) droplets, oil cinders,smoke, odor and etc., to be exhausted and this causes seriousenvironmental pollution, particularly air pollution. In order to solvethis problem, several types of known methods and systems for purifyingthe polluted poisonous exhaust gas have been proposed.

For example, there has been proposed an exhaust gas purifying systemwhich comprises a plurality of large and small reservoirs sequentiallyarranged such that they communicates with each other through a pluralityof pipe lines. In this known system, the polluted poisonous exhaust gasoutputted from the progress of work is permitted to sequentially passthrough the reservoirs, into which predetermined chemicals such asneutralizing agents are added at the same time so as to make the exhaustgas be neutralized. On the other hand, there has been proposed anothertype of exhaust gas purifying system which additionally comprises alarge-sized dust collection equipment, such as a cyclone dust collector,besides the aforementioned construction comprising the plurality oflarge and small reservoirs of the above exhaust gas cleaning system. Inthis latter system, the exhaust gas first passes through the dustcollection equipment prior to its entrance into the reservoirs so that apart of the pollutants in the shape of dust is previously removed fromthe exhaust gas. Thereafter, the remaining exhaust gas is permitted tosequentially pass through the reservoirs wherein predetermined chemicalsare added to the exhaust gas so as to cause the exhaust gas to beneutralized.

However, in these types of known exhaust gas purifying systems, it isrequired not only to add the chemicals, neutralizer, to the exhaust gaspassing through the reservoirs but also to consume a plurality of fabricfilters. In result, these known systems have a disadvantage in that theyinevitably cause the user to pay an enormous operational expense due tothe consumption of the high expensive chemicals and fabric filters.Furthermore, as the added chemicals must be purified in the finalprocess of the exhaust gas purifying operation, another disadvantage ofthe known systems resides in that an additional expense is required tobe worn and torn and its purification processes are unwillinglycomplicated. Besides the aforementioned disadvantages, these knownsystems have further disadvantage in that they can not provide a desiredpurification efficiency. On the other hand, each of these known exhaustgas purifying systems is run on a very extensive scale so that it hasstill further disadvantage in that it introduces not only difficulty insecuring the installing place therefor but also a huge equipment expenseto the user and this makes the user, particularly small and mediumenterprises, to be lath to have the exhaust gas purifying system,moreover, the known systems make the maintenance thereof be difficultdue to its complicated construction.

SUMMARY OF THE INVENTION

It is, therefore, an object of the present invention to provide a methodand a multi-ejector type of system for purifying a polluted poisonousexhaust gas in which the aforementioned disadvantages can be overcomeand which accomplish a simple process of exhaust gas purification and asimple construction, thereby making it possible to reduce the installingarea thereof, the equipment expense and the operational expense.

It is another object of the present invention to provide a method and amulti-ejector type of system for purifying a polluted poisonous exhaustgas in which the polluted poisonous exhaust gas is completely purifiedbecause all of the pollutants can be removed therefrom and, in thisregard, an improved efficiency of the exhaust gas purification isaccomplished.

In accordance with an embodiment, the present invention provides amulti-ejector type of system for purifying polluted poisonous exhaustgas comprising: a pre-processing part for preliminarily removingpollutants from the exhaust gas and for causing the exhaust gas to beheat-exchanged with the cooling water so as to permit the exhaust gastemperature to be reduced to a predetermined degree and apost-processing part for neutralizing and washing the exhaust gas, whichhas been processed in the pre-processing part, so as to cause theremaining pollutants to be completely removed from the exhaust gas, saidpost-processing part being connected to the pre-processing part by meansof a plurality of pipe lines.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent invention will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIGS. 1A and 1B are continued schematic views showing a construction andexhaust gas purifying operation of an embodiment of a multi-ejector typeof exhaust gas purifying system in accordance with the presentinvention, in which:

FIG. 1A shows a pre-processing part wherein dust is preliminarilyremoved from the exhaust gas and the exhaust gas temperature is reducedto a predetermined degree; and

FIG. 1B shows a post-processing part wherein the exhaust gas isrepeatedly neutralized and washed so as to make the pollutants becompletely removed therefrom;

FIG. 2 is an enlarged view of a first neutralizing reservoir of the "C"section of FIG. 1B;

FIG. 3 is an enlarged view of a cooling water ejection nozzle and anejector of the "D" section of FIG. 1B;

FIG. 4 is an enlarged view of an atomizing member of the "E" section ofFIG. 1B;

FIG. 5 is a plane view of three corrugated walls of a first gas/waterseparating reservoir of the post-processing part of FIG. 1B;

FIG. 6 is an elevational sectioned view taken along the section lineF--F of FIG. 5;

FIG. 7 is a block diagram showing the exhaust gas purifying processescarried out by the system in accordance with the present invention;

FIG. 8 is an elevational sectioned view of a water-cooled indirect typeof heat exchanger of the pre-processing part of FIG. 1A; and

FIGS. 9A to 9C show an inner structure of a gas washing part of thepost-processing part of FIG. 1B, in which:

FIG. 9A is an elevational sectioned view of the gas washing part;

FIG. 9B is a plane view of a circular partition; and

FIG. 9C is a plane view of a semicircular partition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to FIGS. 1A and 1B showing a construction and exhaust gaspurifying operation of an embodiment of a multi-ejector type of exhaustgas purifying system in accordance with the present invention, thispurifying system is divided broadly into two parts, that is, apre-processing part 100 of FIG. 1A and a post-processing part 200 ofFIG. 1B. The former part 100 is adapted not only to cause a part of thepollutants in the shape of dust to be removed from the exhaust gas butalso to cause the exhaust gas temperature to fall to a predetermineddegree, while the latter part 200 is adapted to neutralize the remainingexhaust gas outputted from the former part 100 and to cause theremaining pollutants to be completely removed from the exhaust gasbefore the exhaust gas is exhausted to the atmosphere.

As depicted in FIG. 1A, the pre-processing part 100 includes at leastone, preferably two, cyclone dust collector 1 wherein the floating dustand the oil cinders in the exhaust gas are preliminarily removed fromthe exhaust gas by virtue of the cyclone effect. This cyclone dustcollector 1 is in turn connected at its exhaust gas output port to atwo-pass type of heat exchanging part, comprising three water-cooledindirect type of heat exchangers 2 and 3 wherein the polluted poisonousexhaust gas of high temperature is neat-exchanged with the cooling waterand, in this regard, its temperature falls to a predetermined degree asit sequentially passes through the heat exchangers 2 and 3. Here, thefirst and second heat exchangers 2 are directly connected to the gasoutput port of the cyclone dust collector 1, respectively, while thethird heat exchanger 3 is connected to the output ports of the first andsecond heat exchangers 2. This third heat exchanger 3 is provided with agas output port which is in turn connected to a direct type of heatexchange cooler 4, which provides a water jet of a predeterminedpressure for the exhaust gas so as to cause the temperature of theexhaust gas to rapidly fall simultaneously with extracting apredetermined amount of pollutants from the exhaust gas as thepollutants dissolve in the water jet. In addition, the pre-processingpart 100 is provided with a gas/water separator 5 to which the outputport of the heat exchange cooler 4 is also connected. Upon reception ofthe exhaust gas containing the pollutants which is outputted from theheat exchange cooler 4, this gas/water separator 5 separates themoisture from the exhaust gas containing the pollutants. The gas/waterseparator 5 is also connected at its output port to a suction blower 6,which provides a suction power for all of the aforementioned members 1,2, 3, 4 and 5. Additionally, a cooling tower 7 is connected to all ofthe three water cooled indirect type of heat exchangers 2 and 3 so as tosupply the cooling water for the three members 2 and 3. Thepre-processing part 100 is also provided with an auxiliary cooler 8 ofwhich its two input ports are respectively connected to the third heatexchanger 3, the heat exchange cooler 4 and the gas/water separator 5 insuch a manner that the one port is connected to the exchanger 3 and theother port is connected to both the cooler 4 and the separator 5. Thisauxiliary cooler 8 has three functions, that is, the first function forcollecting the drained cooling water outputted from the third heatexchanger 3, the heat exchange cooler 4 and the gas/water separator 5 soas to in turn permit the collected cooling water to return to thecooling tower 7, the second function for supplying the cooling water fora water collection reservoir 20 of the post-processing part 200 as willbe described below and the third function for auxiliarly cooling thecooling water which has returned from the water collection reservoir 20.

In the pre-processing part 100, the cooling water of the cooling tower 7is circulated through a closed cooling water circulation pipe linesystem. This pipe line system comprises six water circulation pipe lines12 to 16 and 16a. The first pipe line 12 makes the cooling tower 7, thefirst and second 15 heat exchangers 2 and a motor pump 11 be connectedto each other. Through this pipe line 12, the cooling water of thecooling tower 7 is permitted to be supplied for the heat exchanger 2 inorder to exchange the heat with the high temperature exhaust gas and inturn returns to the cooling tower 7 using the power generated by themotor pump 11. The second pipe line 13 makes the cooling tower 7, thethird heat exchanger 3 and the auxiliary cooler 8 be connected to eachother and permits the cooling water of the cooling tower 7 tosequentially pass through the third heat exchanger 3 and the auxiliarycooler 8, thereafter, to return to the cooling tower 7. The third pipeline 14 connects both the heat exchange cooler 4 and the gas/waterseparator 5 to the auxiliary cooler 8, while the fourth pipe line 15connects the auxiliary cooler 8 to the water collection reservoir 20. Onthe other hand, the fifth pipe line 16 connects the water collectionreservoir 20 to both the first neutralizing reservoir 21 of thepost-processing part 200 and the auxiliary cooler 8, while the sixthpipe line 16a connects the fifth pipe line 16 between the watercollection reservoir 20 and the first neutralizing reservoir 21 to theheat exchange cooler 4, thereby permitting the cooler 4 to be suppliedwith the cooling water outputted from both the water collectionreservoir 20 and the first neutralizing reservoir 21.

Additionally, in order to cause the poisonous gas containing thepollutants to sequentially pass through the cyclone dust collector 1,the heat exchangers 2 and 3, the heat exchange cooler 4, the gas/waterseparator 5 and the suction blower 6, there is provided a gas pipe line17 which connects the members 1, 2, 3, 4, 5, and 6 to each other. Fromthe suction blower 6, this gas pipe line 17 also extends to a gasdistribution pipe 22 which is in turn connected to the firstneutralizing reservoir 21 of the post-processing part 200. On the otherhand, the pollutants extracted from the exhaust gas by the members 1, 2and 3 of the pre-processing part 100 are drained to a pollutantcollection reservoir 19 through a pollutant output pipe line 18, whichis connected between the members 1, 2 and 3 and the reservoir 19,thereafter, the pollutants are discharged from the reservoir 19 to apollutant treating device (not shown) by a motor pump 19a.

On the other hand, FIG. 1B shows the post-processing part 200. Asdepicted in this drawing, the post-processing part 200 includes aplurality of first neutralizing reservoirs 21 each having apredetermined scale. These first neutralizing reservoirs 21 arecircumferentially arranged as surrounding a second neutralizingreservoir 24 and these reservoirs 21 are spaced apart from each other bya predetermined circumferential interval. The first neutralizingreservoirs 21 are respectively connected to the gas pipe line 17 of thepre-processing part 100 by way of the plurality of gas distributingpipes 22 which are radially arranged so as to connect the gas pipe line17 to the radially arranged reservoirs 21. In order to connect eachreservoir 21 to each corresponding gas distributing pipe 22, a dischargeport 22a of the gas distributing pipe 22 is inserted in the reservoir21. The first and second neutralizing reservoirs 21 and 24 are connectedto each other by means of a plurality of gas outlet pipes 23. Below thesecond neutralizing reservoir 24, a first gas/water separating reservoir26 is vertically disposed in such a manner that it is connected to thesecond neutralizing reservoir 24 through a plurality of connection pipes25. At the inner middle portion of the first gas/water separatingreservoir 26, an inlet port 27a of a gas washing part 27 is disposedsuch that its uppermost end is located at the middle portion of thereservoir 26 and, in this regard, the two members 26 and 27 areconnected to each other. The gas washing part 27 is provided with aplurality of washing bars 27b which are vertically arranged in thewashing part 27 and each has a predetermined length and a relativelysmall diameter. This gas washing part 27 is also connected to a secondgas/water separating reservoir 28 by means of its tower output port 27c.Below the second gas/water separating reservoir 28, the water collectionreservoir 20 is disposed as connected to the reservoir 28 by means of aplurality of connection pipes 29. In addition, this post-processing part200 is provided with a third neutralizing reservoir 31 which isvertically disposed above the second neutralizing reservoir 24 asconnected to the reservoir 24 by means of a plurality of connectionpipes 30. At this third neutralizing reservoir 31, the final process ofthe exhaust gas purifying operation is carried out.

On the other hand, the radially disposed gas outlet pipes 23 forconnecting the first and second neutralizing reservoirs 21 and 24 toeach other are concentrated on a gas outlet port 23a which is verticallyconnected to the lower part of the second neutralizing reservoir 24 andprovides a gas ascending passage 32 for the second reservoir 24. At apredetermined position inside the outlet port 23a, chemical ejectionnozzles 35 are disposed as supported by a nozzle support member 35'. Inorder to supply the chemicals, such as a neutralizer, for this chemicalejection nozzles 35, there is additionally provided a chemical reservoir33 which is connected to the nozzles 35 by means of a chemical feed pipeline 34. Also, in order to recover the used chemicals from the secondneutralizing reservoir 24, a chemical recovering pipe line 34a isprovided as connected between a chemical output port 24a, which isdisposed at the lower part of the second neutralizing reservoir 24, andthe chemical reservoir 33. In addition, a motor pump 37 is provided onthe chemical feed pipe line 34 so as to make the chemicals be circulatedand, in this regard, to cause the chemical ejection and recoveringoperation to be repeatedly performed.

In the fifth pipe line 16 which is connected between an output port 20aof the water collection reservoir 20 and cooling water inlet ports 21aof the first neutralizing reservoirs 21, a pair of filters 40 and 41 anda motor pump 42 are sequentially arranged. Owing to such an arrangement,the cooling water is repeatedly circulated simultaneously with beingfiltered off the pollutants therefrom as it passes through the filters40 and 41. In addition, a check valve 43 and a small capacity motor pump44 are sequentially connected between the filter 41 and the motor pump42. These members 43 and 44 are adapted to prevent this exhaust gaspurifying system from being unwillingly broken due to a low temperaturein winter. In other words, if this system is necessarily continuouslystops its operation in winter, it may be broken as its cooling water isfrozen hard due to the low temperature. However in this system, thecheck valve 43 and the small capacity motor pump 44 can be driven so asto cause the cooling water to be continuously circulated irrespective ofthe continued operational stop of this system and, in this regard, thecooling water is efficiently prevented from being frozen due to the lowtemperature and this makes this system from being broken.

In addition, a cooling water circulation pipe line 45 is connectedbetween a cooling water output port 21b of each first neutralizingreservoir 21 and a cooling water input port 27h of the gas washing part27. Thus, the cooling water is permitted to be supplied from the firstneutralizing reservoir 21 to the gas washing part 27.

On the other hand, this post-processing part 200 is provided with twopollutant extracting chambers 46 and 47, the former 46 being disposedbetween the second gas/water separating reservoir 28 and the watercollection reservoir 20 while the latter 47 being disposed between thegas washing part 27 and the first gas/water separating reservoir 26. Inaddition, each first neutralizing reservoir 21 is provider at it lowerpart with a pollutant output port 21c. The two pollutant extractingchambers 46 and 47 and the pollutant output port 21c of the firstneutralizing reservoir 21 are respectively connected to the pollutantcollection reservoir 19, shown in FIG. 1A, by way of the pollutantdischarging pipe lines K1, K2 and K3, thereby permitting the pollutantsextracted in the respective processes carried out by the post-processingpart 200 to be discharged to the pollutant collection reservoir 19through the pollutant pipe lines K1, K2 and K3.

As depicted in FIG. 1B, the fifth pipe line 16, connecting the firstneutralizing reservoirs 21 to the water collection reservoir 20, is alsoprovided with a temperature sensor 48 and a solenoid valve 49. Thesemembers 48 and 49 are disposed at a branching portion of the pipe line16, at which branching portion the pipe line 16 is also connected to theauxiliary cooler 8, and are adapted to control, in cooperation with eachother, the flow passage of the cooling water, circulated between thefirst neutralizing reservoirs 21 and the water collection reservoir 20,in accordance with the cooling water temperature. In other words, thesensor 48 senses the temperature of the cooling water, which isrepeatedly circulated between the water collection reservoir 20 and thefirst neutralizing reservoirs 21 through the fifth pipe line 16, so asto determine whether the temperature of the cooling water is higher thana predetermined reference temperature, for example, about 20° C. If thesensed temperature is higher than the reference temperature, the sensor48 causes the solenoid valve 49 to start its operation for permittingthe cooling water to be introduced to the auxiliary cooler 8 instead ofthe first neutralizing reservoirs 21.

On the other hand, the third neutralizing reservoir 31 is provided atits upper part with a chemical inlet port 50 and at its lower part witha chemical output port 51. The two ports 50 and 51 are connected to eachother by way of a chemical circulation pipe line 52 which is alsoequipped with a motor pump 54. At an inner center of the thirdneutralizing reservoir 31, a chemical ejection nozzle 53 is verticallydownwardly arranged as connected to the chemical inlet port 50. Thus,the chemicals such as the neutralizer are repeatedly circulated throughthe chemical circulation pipe line 52, the motor pump 54, the inlet port50, the ejection nozzle 53 and the output port 51.

Of the post-processing part 200, each first neutralizing reservoir 21primarily receives the pre-purified exhaust gas outputted from thepre-processing part 100 through the gas pipe line 17 and the gasdistributing pipe 22. With reference to FIG. 2, which is an enlargedsectioned view of the first neutralizing reservoir 21, together withFIG. 1B, this reservoir 21 is provided with a pair of lateral partitions21d and 21e between the discharge port 22a of the gas distributing pipe22 and an inlet port 23b of the gas outlet pipe 23. The partitions 21dand 21e are disposed so as to be vertically spaced from each other by apredetermined interval, thereby providing a gas inlet chamber 21ftherebetween. Here, the upper partition 21d is provided with a pluralityof cooling water ejection nozzles 21g which are vertically disposed suchthat they penetrate the upper partition 21d until their lower endsnearly reach the lower part of the gas inlet chamber 21f. These coolingwater ejection nozzles 21g permit the cooling water flowing in throughthe cooling water inlet port 21a to downwardly spout. Also, below thecooling water ejection nozzles 21g, a plurality of diffusers 21h arevertically arranged in such a manner that the upper end of each diffuser21h is aligned with a corresponding ejection nozzle 21g. Each diffuser21h has a vertical flow passage 21h' of which the inner diameter isgradually reduced until it reaches its middle part but graduallyincreased until it reaches its lower end. By virtue of such an intrinsicstructure of the flow passage 21h' provided by the diffusers 21h, thewater-soluble pollutants in the exhaust gas easily dissolves in thecooling water as the exhaust gas downwardly passes together with thecooling water through the flow passage of each diffuser 21h. On theother hand, a plurality of atomizing members 21i, each having adepressed hemispherical atomizing surface 21i' at its uppermost end, arevertically arranged below the lower ends of the diffusers 21h,respectively, thereby causing the cooling water, which continuouslydropped from the diffusers 21h along with the exhaust gas, to be struckagainst the atomizing surfaces 21i' so as to fly in all directions andto fall down to the bottom of the first neutralizing reservoir 21. Inresult, the water-soluble pollutants of the exhaust gas fall down to thebottom of the first neutralizing reservoir 21 in the state of dissolvingin the cooling water and are in turn introduced to the pollutantcollection reservoir 19 through the pollutant output port 21c and thepollutant discharging pipe line K3. Here, the pollutants dissolving inthe cooling water in a water collection chamber 21j of the firstneutralizing reservoir 21 has a relatively low specific gravity,conventionally not more than 0.9, so that the pollutants float in theupper surface of the cooling water. Therefore, the pollutant output port21c is preferably disposed at the upper part of the water collectionchamber 21j so as to cause the pollutants floating in the upper surfaceof the cooling water in the water collection chamber 21j to be naturallydischarged therefrom. On the other hand, the remaining exhaust gas, fromwhich almost pollutants has been removed, is discharged from the inletport 23b of the gas outlet pipe 23 so as to be in turn introduced to thesecond neutralizing reservoir 24 wherein the continued purifying processfor the exhaust gas is performed.

As shown in FIGS. 1B and 3, the second neutralizing reservoir 24, whichis connected to the first neutralizing reservoirs 21 through the gasoutlet pipe 23 so as to be applied with the exhaust gas from the firstneutralizing reservoirs 21 as above described, comprises a plurality ofejectors 24b which are circumferentially vertically laid across thecylindrical inner surface of the side wall of the second reservoir 24.These ejectors 24b are also vertically aligned at the lowermost ejectorwith the upper end of a corresponding connection pipe 25 through whichthe ejectors 24b communicate with the first gas/water separatingreservoir 26. Each ejector 24b is also provided therein with aspiral-shaped flow passage 24b'. On the other hand, above the uppermostejector 24b, a cooling water ejection nozzle 24c' is vertically disposedas mounted on the upper cover of the second reservoir 24 so as to bevertically aligned with the spiral-shaped flow passage 24b'. In result,the exhaust gas, having been introduced into the second reservoir 24through the outlet port 23a of the gas outlet pipe 23, is introducedinto the spiral-shaped flow passage 24b' of the ejectors 24b along withthe cooling water, the latter being ejected by the cooling waterejection nozzles 24c. Owing to the spiral shape of the flow passage24b', there occurs a vortex flow in the passage 24b' and this makes theexhaust gas be sufficiently mixed with the cooling water. The mixture isthen introduced into the first gas/water separating reservoir 26 throughthe connection pipes 25.

On the other hand, the second neutralizing reservoir 24 is alsoprovided, at its upper part, with a lateral partition 24e of which thecenter is formed with a center cylinder 24f so as to provide a throughhole 24g. In addition, above the outlet port 23a of the gas outlet pipe23, a gas dispersing plate 24i is laterally arranged so as to be spacedapart from the outlet port 23a by a predetermined distance. In order tosupport the gas dispersing plate 24i at its position, there are provideda pair of support columns 24h each of which downwardly extends from thelateral partition 24e. In result, the exhaust gas, which has beenintroduced into the second reservoir 24 through the outlet port 23a ofthe pipe 23, is mixed with the chemicals, such as the neutralizer, whichspout from the chemical ejection nozzles 35, so as to be neutralized.This neutralized exhaust gas in turn ascends until it is struck againstthe under surface of the gas dispersing plate 24i. At this gasdispersing plate 24i, the exhaust gas turns its flowing direction to thedownward direction and again ascends in order to be introduced into thethrough hole 24g of the center cylinder 24f. At the same time, thecooling water is downwardly ejected from the cooling water ejectionnozzles 24c'. The exhaust gas containing the pollutants is introducedinto the flow passage 24b' of the ejectors 24b and passes therethroughalong with the cooling water which is ejected from the cooling waterejection nozzle 24c'. Thus, almost the pollutants remaining in theexhaust gas is neutralized as the exhaust gas passes through the flowpassage 24b'. At this time, the neutralizer remaining in the secondneutralizing reservoir 24 is discharged from the output port 24a of thereservoir 24 and passes through the chemical recovering pipe line 34a soas to be recovered by the chemical reservoir 33. Thereafter, the motorpump 37 causes the neutralizer, which has been recovered by the chemicalreservoir 33, to be supplied to the chemical ejector nozzles 35. Here,the neutralizer is preferably selected from the acid, alkali and neutralchemicals. Moreover, the respective pressures in the first and secondneutralizing reservoirs 21 and 24 can be controlled by the suctionblower 6 such that each pressure is controlled to be "+" pressure morethan the atmospheric pressure or "-" pressure not more than theatmospheric pressure.

On the other hand, the first gas/water separating reservoir 26 isconnected to the ejectors 24b of the second neutralizing reservoir 24 soas to receive the cooling water which has been mixed with the condensedexhaust gas when downwardly passing through the spiral-shaped flowpassage 24b' of the ejectors 24b. This first gas/water separatingreservoir 26 also permits the inlet port 27a of the gas washing part 27to be inserted therein such that the uppermost end of the inlet port 27ais located at the middle portion of the reservoir 26. In addition, anatomizing member 26b, having a depressed hemispherical atomizing surface26a at its uppermost end, is vertically arranged below the lowermost endof each connection pipe 25 as mounted on the side wall of the firstgas/water separating reservoir 26 as depicted in detail in FIG. 4. Owingto such a construction, the cooling water, which continuously drops fromthe connection pipes 25 along with the exhaust gas, is struck againstthe atomizing surfaces 26a so as to fly in all directions and to falldown to the bottom of the reservoir 26. In addition, the first gas/waterseparating reservoir 26 is provided with three corrugated walls 26c,26c' and 26c" which have different sizes and are concentricallyvertically arranged. As shown in FIGS. 5 and 6, these three corrugatedwalls 26c, 26c' and 26c", preferably made of teflon, stainless steel ornylon, are vertically disposed such that they are radially spaced apartfrom each other by a predetermined interval and also the innermost wall26c" is spaced apart from the outer circumferential surface of the inletport 27a of the gas washing part 27. Here, the middle wall 26c' upwardlyextends from the bottom surface of the reservoir 26 while the outermostand innermost walls 26c and 26c" downwardly extend from the uppersurface of the reservoir 26. The free ends of the three walls 26c, 25c'and 26c" provide, in cooperation with the upper and bottom surfaces ofthe reservoir 26, openings so as to permit the exhaust gas to passtherethrough. Owing to such a construction, the cooling water is struckagainst the atomizing surfaces 26a so as to fly in all directions in theshape of minute droplets and these minute droplets are then struckagainst the outer surface of the outermost wall 26c. Thus, almost thewater-soluble pollutants remaining in the exhaust gas dissolves in thecooling water droplets on the outer surface of the outermost wall 26cand falls down to the bottom of the reservoir 26 along with the coolingwater, while the remaining exhaust gas ascends along a first corrugatedpassage provided between the outermost and middle corrugated walls 26cand 26c' . As this exhaust gas reaches the upper part of the firstcorrugated passage, it passes through the opening provided between theupper surface of the reservoir 26 and the upper free end of the middlewall 26c' so as to in turn descend along a second corrugated passageprovided between the middle and innermost corrugated walls 26c' and26c", Upon reaching the lower part the second corrugated passage, theexhaust gas passes through the opening provided between the bottomsurface of the reservoir 26 and the lower free end of the innermost wall26c" so as to in turn ascend along the third passage provided betweenthe innermost corrugated wall 26c" and the outer surface of the inletport 27a. Thereafter, the exhaust gas is introduced into the inlet port27a so as to be applied to the gas washing part 27. During such asequential ascending and descending of the exhaust gas along the firstto third corrugated passages, the moisture remaining in the exhaust gasis dewed on the inner and outer surfaces of the three corrugated walls26c, 26c' and 26c" and, in this respect, the remaining moisture isefficiently removed from the exhaust gas. The dewed moisture then dropsto the bottom of the reservoir 26. Here, in order to cause the coolingwater collected on the bottom of the reservoir 26 inside of the middlewall 26c' to be drained to the outside of the middle wall 26c', thereare provided at the lower part of the middle wall 26c" a plurality ofthrough holes 26e through which the inside and the outside of the middlewall 26c' to communicate with the each other. On the other hand, thecooling water containing the water-soluble pollutants is discharged fromthe discharge port 26d so as to permit the pollutants to be collected bythe pollutant collection reservoir 19.

The exhaust gas, from which almost pollutants has been removed, is thenintroduced into the gas washing part 27 through the gas inlet port 27aso as to be washed. As depicted in detail in FIGS. 9A to 9C, this gaswashing part 27 comprises the plurality of small-diameter washing bars27b which are vertically enclosed in a large-diameter outer pipe. Here,in order to provide a gas flow passage and to support the small-diameterwashing bars 27b in the large-diameter outer pipe, the large-diameterouter pipe is provided at its upper and lower inner parts with upper andlower circular partitions 27f (shown in detail in FIG. 9B),respectively, each of which has an outer diameter which is slightlysmaller than the inner diameter of the large-diameter outer side so asto provide an annular passage 27g between the outer periphery of thepartition 27f and the inner surface of the large-diameter outer pipe. Inaddition, a pair of semicircular partitions 27d (shown in detail in FIG.9C) are laterally oppositely mounted on the inner middle surface of thelarge-diameter outer pipe so as to provide a center passage 27e betweenthe inner peripheries of the partitions 27d. These partitions 27d and27f are also provided with a plurality of through holes for causing thesmall-diameter washing bars 27b to penetrate therethrough so as to besupported at their vertical positions. Owing to such a construction ofthe gas washing part 27, the exhaust gas, which has been introduced intothe gas washing part 27, descends along a curved passage such that itfirst passes through the upper annular passage 27g, thereafter, turnsits flowing direction to radially inward direction so as to pass throughthe center passage 27e and in turn radially outwardly turns its flowingdirection so as to pass through the lower annular passage 27g. Here, thelarge-diameter outer pipe and the small-diameter washing bars 27b arepreferably controlled in their lengths as required. On the other hand,the gas washing part 27 is also provided at its upper side wall with acooling water inlet port 27h through which the cooling water flows in.Thus, the pollutants remaining in the exhaust gas, when this exhaust gasdescends toward the outlet port 27c through the curved passage in thegas washing part 27, is moisturized by the cooling water and dewed onthe outer surfaces of the washing bars 27b and this makes the gaspurification efficiency be improved. In addition, this gas washing part27 includes an upper outlet port 47 through which small amount ofgaseous pollutants such as DOP are discharged so as to be in turncollected by the pollutant collection reservoir 19.

The exhaust gas is then applied together with the cooling water from thegas washing part 27 to the second gas/water separating reservoir 28 andenters the third neutralizing reservoir 31 by way of the connectionpipes 30. Here as shown in FIG. 1B, the second gas/water separatingreservoir 28 has an atomizing plate 28a having a predetermined size.This atomizing plate 28a is laterally arranged vertically below theoutlet port 27c of the gas washing part 27 so as to cause the coolingwater containing the pollutants is struck against the upper surface ofthe atomizing plate 28a so as to fly in all directions and to fall down.In result, additional gas/water separating efficiency is obtained. Onthe other hand, the water collection reservoir 20, to which the coolingwater downwardly flows from the second gas/water separating reservoir 28through a plurality of connection pipes 29, is provided at its upperpart with the upper pollutant extracting chamber 46. Thus, the gaseouspollutants, such as the DOP, in the water collection reservoir 20ascends high up to the upper pollutant extracting chamber 46 anddischarged to the pollutant collection reservoir 19 by way of thepollutant discharging pipe line K1.

The third neutralizing reservoir 31 comprises an outer casing 31a whichencloses a conical-shaped water collection member 31b. Below the watercollection member 31b, a pig hair filter 31c and the chemical ejectionnozzle 53 are sequentially arranged. This third neutralizing reservoir31 is also provided with a plurality of washing bars 31d each of whichdownwardly inclinedly extends from the side surface of the nozzle 53toward the inner surface of the side wall of the reservoir 31. Thus, theexhaust gas, which has been introduced in the reservoir 31 through theconnection pipes 30, is mixed with the neutralizer ejected from thenozzle 53 and the mixture upwardly passes by the washing bars 31d,thereby causing the remaining pollutants to be dewed on the washing bars31d and in turn to drop to the bottom of the reservoir 31. At this time,the purified exhaust gas continuously ascends high up to the watercollection member 31b through the pig hair filter 31c. As the gasreaches water collection member 31b, it is struck against the undersurface of the member 31b so as to turn its flowing direction downwardlyand in turn exhausted to the atmosphere through the passage providedbetween the outer casing 31a and the water collection member 31b,thereby causing the remaining moisture and pollutants to be completelyremoved from the exhaust gas.

In FIG. 1A, the reference numeral 55 denotes a small capacity motor pumphaving the same function as that of the aforementioned motor pump 44 ofFIG. 1B.

Hereinafter, the exhaust gas purifying processes performed by thepresent purifying system having the aforementioned construction will bedescribed in detail in conjunction with the block diagram of FIG. 7.

PROCESS 1

In this process, the polluted poisonous exhaust gas containingpollutants, which is inevitably generated from the progress of work ofthe manufactories of various kinds, such as for manufacturing the food,the leather goods, the plastic goods and etc., is permitted to passthrough at least one cyclone dust collector 1 having the conventionalconstruction, thereby preliminarily removing a part of the pollutantssuch as dust and DOP from the exhaust gas.

As the exhaust gas is treated in this process, about 5% of pollutants inthe exhaust gas is preliminarily removed from the gas owing to thecyclone effect provided by the cyclone dust collector 1. Here, thenumber of cyclone dust collector 1 may be selected in accordance withthe amount of the exhaust gas which intends to be treated. The removedpollutants are drained to the pollutant collection reservoir 19 by wayof the pollutant output pipe line 18 in order to be then discharged tothe pollutant treating device.

PROCESS 2

In this process, the polluted poisonous exhaust gas, which has beentreated in the process 1 so as to permit a predetermined amount ofpollutants to be removed therefrom, is permitted to pass through thewater-cooled indirect type of heat exchangers 2 and 3, each having theconventional construction, in order to cause the exhaust gastemperature, conventionally having the range of about 350° C.-600° C.,to be lowered and a predetermined part of remaining pollutants to beremoved from the exhaust gas.

When the exhaust gas is applied from the cyclone dust collector 1 to theheat exchanger 2 or 3, the exhaust gas slowly descends, as shown in FIG.8, from the upper part of a heat exchanging chamber 2a or 3a of each ofthe heat exchangers 2 and 3 to a lower outlet port 2b or 3b so as to bein turn discharged therefrom. During such a downward flowing of theexhaust gas, this exhaust gas comes in contact with outer surfaces ofheat exchanging pipes 2c or 3c, through which the cooling water iscirculated, thereby causing the temperature of the exhaust gas to berapidly lowered due to heat exchange with the heat exchanging pipes 2cor 3c of low temperature. At this time, there necessarily occurscondensation on the outer surfaces of the heat exchanging pipes 2c or 3cand this causes the pollutants, such as oil cinders, dust and DOP, to beabsorbed by the condensed droplets so as to be removed from the exhaustgas. The pollutants removed from the exhaust gas due to the condensationare then drained to the pollutant collection reservoir 19 by way of thepollutant output pipe line 18 and in turn discharged to the pollutanttreating device. Here, the water-cooled indirect type of heat exchangers2 and 3, the number of them being selected as required, are connected toeach other so as to permit the exhaust gas to sequentially pass throughthe connected heat exchangers 2 and 3.

PROCESS 3

In this process, the polluted poisonous exhaust gas, which has beentreated in the process 2 so as to permit its temperature to be rapidlylowered simultaneously with removing the predetermined amount ofpollutants therefrom, is permitted to pass through the direct type ofheat exchange cooler 4 in order to cause its temperature to be rapidlylowered to a degree less than about 60° C. and to cause a predeterminedpart of water-soluble pollutants to dissolve in the cooling water,thereby permitting about 30% of pollutants to be removed therefrom.

In the direct type of heat exchange cooler 4, the cooling water isdownwardly ejected from the upper part of the cooler 4 and the exhaustgas ascends so as to be discharged from the cooler 4 as contacting withthe ejected cooling water. In result, the temperature of the exhaust gasis rapidly lowered, moreover, a part of the water-soluble pollutantsdissolves in the cooling water, as a result, about 30% of pollutants areremoved from the exhaust gas.

PROCESS 4

In this process, the polluted poisonous exhaust gas, which has beentreated in the process 3 in order to cause its temperature to be rapidlylowered to a degree less than about 60° C. and to cause about 30% ofpollutants to be removed therefrom, is permitted to pass through thegas/water separator 5 so as to cause the moisture to be removedtherefrom, thereafter, the exhaust gas is introduced to the continuedprocess through the gas pipe line 17.

In the aforementioned processes 1 to 4, the exhaust gas sequentiallypasses through the above-mentioned members 1, 2, 3, 4 and 5, which areconnected to each other by the gas pipe line 17, by means of the suctionpower generated by the suction blower 6. Also, when the exhaust gaspasses through the suction blower 6, this gas is then applied to thecontinued member, that is, the first neutralizing reservoir 21, by theblowing power of the blower 6 so as to be processed in the continuedprocess, that is, the following process 5.

PROCESS 5

In this process, the pre-purified exhaust gas, which has beensequentially treated in the above Processes 1 to 4 in order to cause itstemperature to be lowered to a degree less than about 60° C. and tocause at least 30% of pollutants to be removed therefrom, is permittedto pass through the first neutralizing reservoir 21. In this firstneutralizing reservoir 21, the exhaust gas downwardly passes along withthe cooling water, the latter being ejected from the cooling waterejection nozzles 21g, through the diffusers 21h, thereafter, the exhaustgas and the cooling water are struck against the atomizing members 21i.In result, this exhaust gas is sufficiently mixed with the cooling waterand fly in all directions and to fall down to the bottom of the firstneutralizing reservoir 21. Thus, almost the water-soluble pollutants ofthe exhaust gas fall down to the bottom of the first neutralizingreservoir 21 in the state of dissolving in the cooling water. Thus, ifthe exhaust gas has been treated in this process, about 98% ofpollutants is removed therefrom. On the other hand, the purified gas isintroduced into the second neutralizing reservoir 24 through the gasoutlet pipe 23.

The first neutralizing reservoir 21 is supplied with the cooling waterthrough the fifth pipe line 16 and the inlet ports 21a disposed at theupper part of the reservoir 21. The cooling water after passing throughthe above members 21g, 21h and 21i together with the exhaust gas is thenintroduced into the gas washing part 27 through the cooling watercirculation pipe line 45. On the other hand, the removed pollutantsdissolving and floating in the cooling water are permitted to be drainedto the pollutant collection reservoir 19 through the pollutant outputport 21c and the pollutant discharging pipe line K3.

PROCESS 6

In this process, the exhaust gas, which has been treated in the aboveprocess 5 in order to cause a predetermined part of the pollutants to beremoved therefrom and in turn introduced in the second neutralizingreservoir 24 through the gas outlet pipe 23, is permitted to upwardlypass through the second neutralizing reservoir 24. In this secondneutralizing reservoir 24, the exhaust gas sequentially passes alongwith the cooling water, which is ejected from the cooling water ejectionnozzles 21g, through the ejectors 24b so as to be efficiently mixed withthe cooling water. Thereafter, the mixture drops to the first gas/waterseparating reservoir 26, wherein the continued process is performed,through the connection pipes 25. In addition, prior to passing throughthe ejectors 24b in the reservoir 24, the exhaust gas is mixed withneutralizer, which is ejected from the chemical ejection nozzles 35disposed in the outlet port 23a of the gas outlet pipe 23. Thus, as thisexhaust gas is treated by this process 6, at least 99% of pollutants canbe removed therefrom.

Here, the neutralizer is preferably selected from the acid, alkali andneutral Anico liquid or chemicals in accordance with the characteristicsof the exhaust gas. In addition, the cooling water ejection pressure atthe cooling water ejection nozzles 24c is preferably controlled to beless than 10 Kg/cm² and the processing time in this process is preferredto be set within 3 seconds.

On the other hand, in order to reuse the neutralizer remaining in thesecond neutralizing reservoir 24, this neutralizer is circulated suchthat it is discharged from the output port 24a of the reservoir 24 andpasses through the chemical recovering pipe line 34a so as to berecovered by the chemical reservoir 33, thereafter, the recoveredneutralizer is supplied to the chemical ejection nozzles 35 through thechemical feed pipe line 34. In result, the consumption of neutralizercan be efficiently reduced to the minimum.

PROCESS 7

In this process, the cooling water, which drops from the ejectors 24b ofthe second neutralizing reservoir 24 through the connection pipes 25 asmixed with the exhaust gas, is permitted to be introduced into the firstgas/water separating reservoir 26, thereby causing the purified exhaustgas to be separated from the cooling water and to be in turn introducedinto the gas washing part 27 wherein the continued process is performed.In this first gas/water separating reservoir 26, the cooling wateroutputted from the connection pipes 25 is struck against the atomizingsurfaces 26a of the atomizing members 26b each of which is disposedvertically below each connection pipe 25, so as to fly in all directionsin the shape of minute droplets and to fall down to the bottom of thereservoir 26. As a result, the purified exhaust gas is separated fromthe exhaust gas.

The separated exhaust gas in the first gas/water separating reservoir 26then sequentially passes through the three corrugated passages providedby the three corrugated walls 26c, 26c' and 26c", which have differentsizes and are concentrically arranged, and the outer circumferentialsurface of the inlet port 27a of the gas washing part 27. This exhaustgas is, thereafter, introduced into the gas washing part 27 through theinlet port 27a. Here, as the exhaust gas passes through the inside ofthe first gas/wet at separating reservoir 26 as described above, almostthe pollutants is removed therefrom as dissolving in the cooling waterdroplets, which fly in all directions when the cooling water is struckagainst the atomizing surfaces 26a of the atomizing members 26b and arestruck against the outer surface of the outermost wall 26c so as to falldown to the bottom of the reservoir 26. Also, during the sequentialascending and descending of the exhaust gas along the three corrugatedpassages, the moisture remaining in the exhaust gas is dewed on theinner and outer surfaces of the three corrugated walls 26c, 26c' and26c" and, in this respect, the remaining moisture is efficiently removedfrom the exhaust gas.

PROCESS 8

In this process, the purified exhaust gas, which has been treated in theprocess 7, is permitted to downwardly pass through the inside of the gaswashing part 27 in which the plurality of small-diameter gas washingbars 27b are vertically arranged. At the same time, this gas washingpart 27 is supplied with the cooling water by way of the cooling waterinlet port 27h, which is disposed at the upper part of the gas washingpart 27. In result, the pollutants remaining in the exhaust gasdissolves in the cooling water droplets, which are dewed on the outersurfaces of the gas washing bars 27b, and, in this regard, thesepollutants are removed from the exhaust gas.

Here, a part of gaseous pollutants such as DOP are discharged throughthe pollutant extracting chamber 47 provided at the upper part of thegas washing part 27 and collected by the pollutant collection reservoir19. In addition, each small-diameter washing bar 27b may be preferablycontrolled in its length as required.

PROCESS 9

In this process, the cooling water along with the exhaust gas, bothhaving been processed in the process 8, is permitted to introduced intothe second gas/water separating reservoir 28 so as to be struck againstthe atomizing plate 28a and to fly in all directions. In result, theexhaust gas is separated from the cooling water and is in turn upwardlyintroduced to the third neutralizing reservoir 31 by way of theconnection pipes 30.

At this time, the cooling water, which has been struck against theatomizing plate 28a and flown in all directions so as to drop to thebottom of the second gas/water separating reservoir 28, is introducedinto the water collection reservoir 20 through the plurality ofconnection pipes 29. This cooling water is circulated through thecooling water circulation pipe lines 16 and 16a so as to be reused. Onthe other hand, the gaseous pollutants, such as DOP, in the upper partof the cooling water in the water collection reservoir 20 floats in theupper part of the cooling water because of their relatively lowerspecific gravity than that of the water and drained to the pollutantcollection reservoir 19 by way of the pollutant extracting chamber 46and the pollutant discharging pipe line K1.

PROCESS 10

In this process, that is, the last process of the exhaust gaspurification processes in accordance with this invention, the purifiedexhaust gas which has been processed in the process 9 is permitted toupwardly pass through the third neutralizing reservoir 31 so as to becompletely purified and to be exhausted to the atmosphere. In this thirdneutralizing reservoir 31, the exhaust gas upwardly flowing in thereservoir 31 is mixed with the neutralizer, which is ejected from thechemical ejection nozzle 53, and passes by the washing bars 31d so as tocause all of the remaining pollutants to dissolve in the droplets dewedon the outer surfaces of the washing bars 31d and in turn to drop to thebottom of the reservoir 31 together with the droplets. Thereafter, thepurified exhaust gas continuously ascends high up to the watercollection member 31b through the pig hair filter 31c. As the gasreaches the water collection member 31b, it is struck against the undersurface of the member 31b so as to turn its flowing direction downwardlyand in turn exhausted to the atmosphere through the passage providedbetween the outer casing 31a and the water collection member 31b,thereby causing the remaining moisture to be completely removed from theexhaust gas.

Here, the neutralizer is repeatedly circulated through the neutralizercirculation pipe line 52 so as to be reused, thereby causing theconsumption of neutralizer to be efficiently reduced to the minimum.

As described above, the present invention provides a polluted poisonousexhaust gas purifying method and a multi-ejector type of system forperforming such a method in which the polluted poisonous exhaust gas,which is inevitably generated from the progress of work of themanufactories of various kinds, is efficiently completely purified priorto its exhaust to the atmosphere, thereby preventing the exhaust gasfrom contaminating the environment. Particularly, this multi-ejectortype of system has a such simple construction that it is run on a smallscale and requires small equipment expense and, in this regard, theuser, particularly small and medium enterprises, can be easily equippedwith this system without expensive burdensome. In addition, this systemcauses the operational trouble to scarcely occur owing to its simpleconstruction, in this respect, facilitates the maintenance thereof andsubstantially reduces the operational expense. Furthermore, this systempermits the pollutants to be completely removed from the pollutedpoisonous exhaust gas so as to improve the purification efficiency,moreover, the scale of this system, when it is installed, can be easilycontrolled in accordance with the amounts and characteristics of theexhaust gas which is to be treated.

Although the preferred embodiments of the present invention have beendisclosed for illustrative purpose, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims.

What is claimed is:
 1. A method for purifying polluted poisonous exhaustgas, comprising the steps of:a) passing said polluted poisonous exhaustgas containing pollutants through a cyclone, wherein about 5% ofpollutants are preliminarily removed from the exhaust gas and drained toa pollutant collection reservoir through a pollutant output pipe line;b) passing the exhaust gas outputted from said cyclone in step a)through at least one water-cooled indirect heat exchanger for graduallylowering the temperature thereof and removing a predetermined part ofthe pollutants therefrom, wherein condensed water containing thepollutants is drained to said pollutant collection reservoir throughsaid pollutant output pipe line; c) passing the exhaust gas outputtedfrom said heat exchanger in step b) through a direct heat exchangecooler for rapidly lowering the temperature thereof to less than about60° C. and to dissolve a predetermined part of water-soluble pollutantsin a water jet, thereby permitting about 30% of pollutants to be removedtherefrom; d) passing the exhaust gas outputted from said heat exchangecooler in step c) through a gas-water separator for removing therefromthe moisture having dissolved therein a part of pollutants and fordraining to the pollutant collection reservoir; e) passing thepre-purified exhaust gas sequentially treated in steps a)-d) through aplurality of first neutralizing reservoirs wherein the exhaust gas inturn passes sequentially downwardly along with the cooling water throughdiffusers so as to be mixed with the cooling water and to cause about98% of pollutants to be removed therefrom, wherein the exhaust gas mixedwith the cooling water is struck against a plurality of atomizingmembers disposed below the diffusers, so as to fly in substantially alldirections, thereby being separated from the cooling water, and wherebycooling water is introduced into a gas washing means and the pollutantsdissolved in the cooling water are drained to the pollutant collectionreservoir; f) passing the exhaust gas treated in said first neutralizingreservoir in step e), upwardly through a second neutralizing reservoirin which the exhaust gas sequentially passes along with the coolingwater being ejected from a plurality of cooling water ejection nozzles,through spiral-shaped flow passages of ejectors so as to be efficientlymixed with the cooling water, wherein the mixture drops to a firstgas-water separating reservoir and the exhaust gas prior to passingthrough the ejectors is mixed with a neutralizer ejected from thechemical ejection nozzles disposed on the outlet port of the gas outletpipe, thereby causing at least 99% of pollutants to be removedtherefrom; g) introducing the cooling water dropping from the ejectorsof the second neutralizing reservoir through the connection pipes asmixed with the exhaust gas in step f), into said first gas-waterseparating reservoir in which the cooling water is struck againstatomizing surfaces of atomizing members disposed vertically below eachconnection pipe, so as to fly in substantially all directions indroplets, thereby causing the purified exhaust gas to be separated fromthe cooling water, the purified exhaust gas then sequentially passesthrough corrugated passages provided by three corrugated walls, and theouter surface of the inlet port of the gas washing means herein theexhaust gas is introduced into the gas washing means so that themoisture remaining in the exhaust gas is dewed on the inner and outersurfaces of the corrugated walls so as to be removed from the exhaustgas, and the cooling water having the pollutants dissolved therein, isdrained through a pollutant output port; h) passing the exhaust gasoutputted from the first gas-water separating reservoir in step g)downwardly through the inside of said gas washing means by a pluralityof vertically arranged gas washing bars and simultaneously ejecting thecooling water downwardly from an upper part of the gas washing means,thereby causing the pollutants remaining in the exhaust gas to dissolvein the cooling water and be removed from the exhaust gas, and a part ofgaseous pollutants is discharged through a pollutant extracting chamberand collected by the pollutant collection reservoir; i) introducingdownwardly the cooling water along with the exhaust gas, both havingbeen processed in said first gas-water separating reservoir, into asecond gas-water separating reservoir for striking against an atomizingplate and to fly in substantially all directions, thereby causing theexhaust gas to be separated from the cooling water, wherein theseparated exhaust gas is upwardly introduced into a third neutralizingreservoir through a plurality of connection pipes, while the coolingwater drops to the bottom of the second gas-water separating reservoir,the cooling water is, thereafter, introduced into a water collectionreservoir through a plurality of connection pipes so as to be repeatedlycirculated, wherein the extracted pollutants are drained to thepollutant collection reservoir through a pollutant extracting chamber;and j) passing the exhaust gas processed in the aforementioned stepsa)-i), upwardly through said third neutralizing reservoir wherein theexhaust gas is mixed with a neutralizer ejected from a chemical ejectionnozzle, wherein the exhaust gas passes by a plurality of washing bars soas to dissolve the remaining pollutants in droplets dewed on the outersurfaces of said washing bars and be removed from the exhaust gas, andwherein the resultant exhaust gas rises to a water collection memberthrough a filter so as to cause the remaining moisture to be completelyremoved therefrom and exhausted to the atmosphere.
 2. A method accordingto claim 1, wherein said exhaust gas sequentially passes through stepsa)-d) by a power generated by a suction blower disposed on a gas pipeline connected between said gas-water separator and said firstneutralizing reservoirs, and through steps e)-j) by a power generated bysaid blower.
 3. A method according to claim 1, wherein the cooling waterejection pressure at the cooling water ejection nozzle of the first orsecond neutralizing reservoir is controlled to be less than 10 Kg/cm²and the cooling water ejection is continued within 3 seconds.
 4. Amethod according to claim 1, wherein said neutralizer ejected from thechemical ejection nozzles provided in said second neutralizing reservoiris repeatedly circulated through an output port of said secondneutralizing reservoir, a chemical recovering pipe line and a motor pumpso as to be reused.
 5. A method according to claim 1, wherein saidexhaust gas introduced into said second neutralizing reservoir is mixedwith the neutralizer ejected from the chemical ejection nozzles providedin the second neutralizing reservoir so as to be neutralized, and risesuntil it is struck against the under surface of said gas dispersingplate in order to turn its flowing direction downwardly and isintroduced into said ejectors through a hole provided in the secondneutralizing reservoir, thereby causing the neutralizer and thepollutants remaining in the exhaust gas to be removed from the exhaustgas as dissolved in water droplets dewed on the under surface of the gasdispersing plate.
 6. A method according to claim 1, wherein saidneutralizer ejected from the chemical ejection nozzle provided in saidthird neutralizing reservoir is repeatedly circulated through aneutralizer circulation pipe line between a chemical inlet port and achemical outlet port, said ports being provided at upper and lower partsof the third neutralizing reservoir, respectively, and a motor pump soas to be reused.